Expansion-bit for well and rock boring



(No Model.) V

H. G. REIGHARDT. EXPANSION BIT FOR WELL AND BOOK BORING.

Patented July 25 a J i .2 v y z v UNITED STATES PATENT OFFICE.

HENRY O. REIOHARDT, OF POTTSVILLE, PENNSYLVANIAF- EXPANSION-BIT FOR WELLAND ROCK BORING.

SPECIFICATION forming part of Letters Patent No. 261,565, dated July 25,1882. Application filed April 8, 1882. (No model.)

'that it will drill a hole larger than the hole it was introducedthrough.

Expansion-bits for drillingmachines have heretofore been made withcutters operated by water under pressure, and also with hinged wingsprovided with cutting appliances, the wings being operated by means ofcones, on the wedge principle; My device is operated in an entirelydifferent manner, and I provide a means of clearing its working parts ofall dirt and obstructions, as will be more fully explained hereinafter.

' I attain my object by the mechanism illustrated in the accompanyingdrawings, in which similar letters of reference indicate like parts, andin which Figure 1 is a full view of myinvention, and Fig 2 the same Viewwith a part cut away to show its internal construction.

I construct my expansion-bit by taking the shell A and affixing theretothe expansionarms B B B, of which there may be any number desired, bymeans of the pins B B. I then insert in the shell A the hollow stem 0.On this stem (3, Ifornr as many cams X as there are expansion-arms B B.The shoulder I, resting on an offset in the shell A, holds the stem 0 inposition. The lug H on the stem is used as a stop to prevent the stemfrom being turned farther than just enough to throw out theexpansion-arms B B B.

B and E are sleeves or ferrules secured by pins or set-screws to thestem 0, and serve to secure all the parts in proper position.

0 is a water-way through the stem 0, and O is a smaller water-way, ofwhich there should be one for each cam and expansionarm. These smallwater-ways connect with the water-way G, and serve the purpose ofallowing water to flow on the cams and the interior of the shell, so asto keep it free of grit and dirt.

My device is intended to be used in diamond drilling-machines. Theexpansion-arms and lower part of the shell are set with diamonds, asdesired by the driller and nature of the work to be performed.

In drilling where it is desired to use a stand-pipe great difficulty isexperienced in forcing down the stand-pipe whenever a rock orbowlder ismet with. The usual plan adopted is to break or shatter the bowlder bymeans of explosives and then force the stand-pipe through. This is botha troublesome and expensive plan, and leaves the bore-hole in badcondition in many cases.

To use my expansion-bit the driller proceeds with his work in the usualmanner and with the usual bit until he reaches a bowlder. My bit is thenput down. The first quarter-turn of the stem 0 throws out theexpansion-arms, and the drilling proceeds until the bowlder orobstruction is passed through.

It will be seen that the hole made by my bit is larger than the holethrough which it was introduced. Consequently the stand-pipe can bereadily lowered.

There are other uses to which my bit can be put, suchas enlarging adrill-hole at any desired place for the purpose of placingin suchenlarged space a large quantity of explosive material, and many otherpurposes which will be self-evident to a skilled driller.

The bottom of the sleeve E may be used as a bit by having it set withthe usual diamonds, and in such case the core formed would pass upthrough the water-way U. When constructed in this manner it would not benecessary to drill any other hole through the bowlder before using mybit.

What I claim is 1. In an expanding bit foe-diamond drilling-machines,the expanding-arms BB B, operated by a series of cams, X X X, a singlecam opera-ting each arm. i

2. In an expanding bit for diamond drillingmachines, the combination ofthe expandingarms B B B, operated by the cams X X X, lll connection withthe small water-ways (J 0 b communicating with a larger water-way, O,for the purpose of clearing the cams and arms of dirt and grit, and thelug H, which prevents the cams XX X'from-passin g the arms B B B, asshown and set forth.

HENRY O. REICHARDT.

Witnesses:

THOS. ALDERSON, MORGAN REED.

